linux-kernel - Re: [PATCH] libnvdimm: change disk name of virtio pmem disk

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Date:   Fri, 16 Aug 2019 03:36:14 -0400 (EDT)
From:   Pankaj Gupta <pagupta@...hat.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Vishal L Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Ira Weiny <ira.weiny@...el.com>
Subject: Re: [PATCH] libnvdimm: change disk name of virtio pmem disk


> >
> > This patch adds prefix 'v' in disk name for virtio pmem.
> > This differentiates virtio-pmem disks from the pmem disks.
> 
> I don't think the small matter that this device does not support
> MAP_SYNC warrants a separate naming scheme.  That said I do think we
> need to export this attribute in sysfs, likely at the region level,
> and then display that information in ndctl. This is distinct from the
> btt case where it is operating a different data consistency contract
> than baseline pmem.

o.k. I will look to add the information in sysfs and display using ndctl.

Thanks,
Pankaj

> >
> > Signed-off-by: Pankaj Gupta <pagupta@...hat.com>
> > ---
> >  drivers/nvdimm/namespace_devs.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/nvdimm/namespace_devs.c
> > b/drivers/nvdimm/namespace_devs.c
> > index a16e52251a30..8e5d29266fb0 100644
> > --- a/drivers/nvdimm/namespace_devs.c
> > +++ b/drivers/nvdimm/namespace_devs.c
> > @@ -182,8 +182,12 @@ const char *nvdimm_namespace_disk_name(struct
> > nd_namespace_common *ndns,
> >                 char *name)
> >  {
> >         struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
> > +       const char *prefix = "";
> >         const char *suffix = NULL;
> >
> > +       if (!is_nvdimm_sync(nd_region))
> > +               prefix = "v";
> > +
> >         if (ndns->claim && is_nd_btt(ndns->claim))
> >                 suffix = "s";
> >
> > @@ -201,7 +205,7 @@ const char *nvdimm_namespace_disk_name(struct
> > nd_namespace_common *ndns,
> >                         sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
> >                                         suffix ? suffix : "");
> >                 else
> > -                       sprintf(name, "pmem%d%s", nd_region->id,
> > +                       sprintf(name, "%spmem%d%s", prefix, nd_region->id,
> >                                         suffix ? suffix : "");
> >         } else if (is_namespace_blk(&ndns->dev)) {
> >                 struct nd_namespace_blk *nsblk;
> > --
> > 2.20.1
> >
>